Audio speaker



FIG. 1 is a front, side perspective view of an audio speaker of the present design;

FIG. 2 is a front elevational view thereof;

FIG. 3 is a rear elevational view thereof;

FIG. 4 is a left side view thereof;

FIG. 5 is a right side view thereof;

FIG. 6 is a top plan view thereof; and,

FIG. 7 is a bottom plan view thereof.

The broken line showing on the drawing disclosure is for illustrative purposes only and form no part of the claimed design. 

The ornamental design for audio speaker, as shown and described. 